1590s, "compatriot," from Middle French patriote (15c.) and directly from Late Latin patriota "fellow-countryman" (6c.), from Greek patriotes "fellow countryman," from patrios "of one's fathers," patris "fatherland," from pater (genitive patros) "father" (see father (n.)); with -otes, suffix expressing state or condition. Liddell and Scott write that patriotes was "applied to barbarians who had only a common [patris], [politai] being used of Greeks who had a common [polis] (or free-state)."
Meaning "loyal and disinterested supporter of one's country" is attested from c.1600, but became an ironic term of ridicule or abuse from mid-18c. in England, so that Johnson, who at first defined it as "one whose ruling passion is the love of his country," in his fourth edition added, "It is sometimes used for a factious disturber of the government."
Somewhat revived in reference to resistance movements in overrun countries in World War II, it has usually had a positive sense in American English, where the phony and rascally variety has been consigned to the word patrioteer (1928). Oriana Fallaci ["The Rage and the Pride," 2002] marvels that Americans, so fond of patriotic, patriot, and patriotism, lack the root noun and are content to express the idea of patria by cumbersome compounds such as homeland. (Joyce, Shaw, and H.G. Wells all used patria as an English word early 20c., but it failed to stick.) Patriots' Day (April 19, anniversary of the 1775 skirmishes at Lexington and Concord Bridge) was observed as a legal holiday in Maine and Massachusetts from 1894.